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- tanker semi-trailer connected to tractor, Pneumatic brake hoses: Red and yellow provide air brakes.Electrical cables: power lights and ABS system of semi-trailer. Hydraulic connections: Long hoses used control tipper semi-trailers or silo tankers. Puzzle #883639680
tanker semi-trailer connected to tractor, Pneumatic brake hoses: Red and yellow provide air brakes.Electrical cables: power lights and ABS system of semi-trailer. Hydraulic connections: Long hoses used control tipper semi-trailers or silo tankers. Puzzle #883639680